- When it comes to replacing valve cover gaskets, it is important to choose the right size and type for your engine. The 305 valve cover gaskets are specifically designed for engines that have a 305 cubic inch displacement, making them a perfect fit for many popular engine models
305 valve cover gaskets. These gaskets are easy to install and can be done at home with the right tools and instructions.
A wide range of sealing devices are used in various machines.
Sealing devices serve the following functions:
Lubricant Amount - Seals will always perform best when lubricated, however in some machines there are more likely to be dry spells. For these cases, selecting a leather or PTFE seal will be beneficial, as both can operate with less lubrication than others.
Custom PTFE Oil Seals and Other Seals for Your Application
Gaskets and oil seals should be replaced if worn or leaking, or whenever removed during servicing. Replacement is simple, but some engine dismantling may be necessary to reach them. Buy gasket sets from a dealer for the make of car, and state clearly for what parts they are needed.

Heat resistance
Most oil seals consist of some basic elements that configure their structure, such as the sealing element, the metal case, and the spring:
made of a yieldable resilient material having flat sealing faces and comprising two ring portions connected together by an annular portion substantially v-shaped in cross-section which may yield or expand as the mounting requires.
One important factor to consider when choosing spark plugs for your MK7 GTI is the heat range. The heat range of a spark plug refers to its ability to dissipate heat away from the tip of the spark plug. Choosing the right heat range for your MK7 GTI is important to ensure optimal performance and longevity of the spark plugs.
7. Selecting high-quality oil seals
FKM or FPM, which is in well-known brand Viton™, can withstand higher liquid temperatures of up to 180 ˚C. FKM is highly resistant to strong acids and bases, as well as to synthetic oils and greases. Glycol-based oil and grease, however, can also damage FKM.